Application Scenarios:In a bottling plant’s new conveyor control station, engineers needed to power a CompactLogix L32E processor, an Ethernet module, and eight digital I/O modules within a single, narrow cabinet. The existing external power supply was too bulky and generated excessive heat. By integrating the 1769-PA2 directly into the 1769 rack, they eliminated the external unit, reduced wiring complexity, and utilized the module’s bi-directional power distribution to efficiently supply both the left and right sides of the chassis. The wide input voltage range automatically accommodated the plant’s fluctuating 110V AC supply, ensuring stable operation during peak load periods without voltage sag.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Product Model | 1769-PA2 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Category | Compact I/O Power Supply Module |
| Input Voltage | 85–265V AC (47–63 Hz) |
| Output 1 | 5V DC @ 2.0 A (Backplane Logic Power) |
| Output 2 | 24V DC @ 0.8 A (Auxiliary/Sensor Power) |
| Power Rating | 100 VA @ 120V AC, 130 VA @ 240V AC |
| Inrush Current | 25 A max @ 132V AC |
| Mounting | DIN Rail or Panel Mount |
| Dimensions (HxWxD) | 118 x 70 x 87 mm (4.65 x 2.76 x 3.43 in) |
| Operating Temperature | 0 to 60 °C |
| Compatibility | CompactLogix, MicroLogix 1500, 1769 I/O |
Technical Principles and Innovative Values:The 1769-PA2 utilizes a switch-mode power supply (SMPS) design with advanced filtering to provide clean, stable DC power in noisy industrial environments.
- Innovation Point 1: Bi-Directional Backplane Power Distribution: Unlike traditional power supplies that feed in one direction, the 1769-PA2 is engineered to distribute power equally to both the left and right sides of the CompactBus backplane. This allows a single module to support up to 16 I/O modules (8 on each side), maximizing rack density and simplifying power budgeting.
- Innovation Point 2: Universal Wide-Range AC Input: The module features an auto-ranging input circuit that accepts voltages from 85V to 265V AC without manual taps or jumpers. This “set-and-forget” design makes the 1769-PA2 suitable for global machine deployment, automatically adapting to 120V or 240V mains.
- Innovation Point 3: Integrated Protection Suite: The unit incorporates electronic short-circuit protection, overvoltage clamping, and thermal shutdown. This multi-layered protection safeguards both the power supply itself and the expensive connected controllers and I/O modules from electrical faults.
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